Transmitting system



Sept. 5, A. M. TROGNER TRANSMITTING SYSTEM Filed March 26, 1929 4 Sheets-Sheet l INVEN TOR 42: A TTORNEY M4543 9m, 2520 BY SMMW/ WK Sept. 15, 1931. I TRQGNER 1,823,177

TRANSMITTING SYSTEM Filed March 26, 1929 4 Sheets-Sheet 2 INVENTOR. flaw w 9Y6, 5405mm,

BY A-w ATTORNEY.

p 1 3 A. M. TRQGNER 1,823,177

TRANSMITTING SYSTEM Filed March 26. 1929- '4She-ts-Sheet 5 IN VEN TOR.

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A TTORNEY p 1931. A. M. TROGNER TRANSMITTING SYSTEM 4 Sheets-Sheet 4 Filed March 26. 1929 v a 6 I 4 L r a I VENT awr /W are, a 53 A/ A TTORNE JY Patented Sept. 15, 1931 UNITED STATES PATENT .FFEQE ARTHUR M. TROGNE'R, OF EAST ORANGE, NEW JERSEY ASSIGNOR TO RADIO, INCL, NEW YORK, N. Y., A CORPORATION OF DELAWARE TRANSMITTING SYSTEM Application filed March 26, 1929.

My invention relates broadly to transmitting systems and more particularly to transmitting systems of the type employing thermionic tubes in high frequency oscillatory circuits. 7

One of the objects of my invention is to provide a transmitting system wherein operational potential supplied the several elec trodes of thermionic tubes is maintained at 10 the proper value irrespective of changes in the frequency characteristics of the associated circuits.

Another object of my invention is to provide a transmitting system whereby different operational potentials are supplied the several electrodes of thermionic tubes corresponding to different adjustments of the frequency characteristics of the associated circuits.

A further object of my invention is to provide an inductance and switching construction whereby the potential supplied the several electrodes of the thermionic tubes employed is automatically adjusted with the adjustment of said inductance.

Still a further object of my invention is to provide a transmitting system employing thermionic tubes whereby the efiiciency of the system is greatly increased by simultaneously adjusting the control electrode potential supplied said thermionic tubes and adj usting the frequency oharacteristicsof high frequency choke coils associated with said tubes simultaneously with changes in the frequency characteristics of the associated circuits.

A better understanding can be had of the improvements in transmitting systems of my invention by referring to the specification following and to the accompanying drawings wherein:

Figure 1 is a schematic circuit diagram showing the improvements in transmitting systems of my invention;

Fig. 2 shows a modification of the inductance and switching arrangement employed in the transmitting system of my invention; and Figs. 3 and 4t show certain features of my invention in greater detail.

In transmitting systems of the type em- Serial No. 350,010.

ploying thermionic tubes in high frequency oscillatory circuits, it is sometimes desirable, if not necessary, to adjust the operational potentials with changes in the frequency characteristics of the oscillatory circuits. Failure to provide for such adjustment of the potential supplied the several electrodes usually results in damage to-the thermionic tube if not total destruction of the tube. It is further necessary to provide the proper operational potentials to the control electrodes of thermionic tubes when it is desired that multiple frequencies or harmonic frequencies be pronounced.

When thermionic tubes and the circuits associated therewith are adjusted to operate on the fundamental frequency, the potential of a certain value must be changed when the harmonic energy or energy of multiple frequency 1s deslred. In most transmitting systems employing thermionic tubes, the anode and control electrodes are supplied with the proper operational potentials by means of high frequency choke coils. This method is commonly referred to as shunt feed supply. Such choke coils have inherent frequency characteristics and unless these are of the proper value for the frequency employed the high frequency energy will build up in such a manner as to cause a breakdown and damage to the coil. This breakdown causes an indirect damage to the thermionic tubes employed. In other instances such high frequency choke coils, when not of the proper design for the particular frequency employed, cause a reduction in the over-all eificiency of the system by not effectively blocking the passage of high frequency energy as is intended by its use. In the improvements in transmitting systems of my invention the foregoing difliculties are overcome and the efiiciency of the system greatly increased.

Figure 1 of the accompanying drawings shows the improvements in transmitting systems of my invention wherein thermionic tubes 1 and 2 are employed in suitable circuit arrangements for generating and amplifying high frequency electricalenergy. The input circuit of thermionic tube 1 includes cathode4 and control electrode 5.

mil

Control electrode 5 is connected to electrode 67 of multiple piezo electric crystal holder 65. Crystal holder carries a multi plicity of crystals adapted to be selectively placed in electrical relation with stationary electrode 67. Cathode 4 of thermionic tube 1 is energized from source 9. Anode 3'18 energized from source 11 through high frequency choke coil 29. Anode 3 is connected with inductance system 18 by means of contacting members 19. Contacting members 19 are adapted to engage with corresponding contacting members of inductance system 18. The latter conducting members may be positioned on the winding comprising the inductance. Inductance system 18 may be further adjusted by means of variable capacity 17. Thermionic tube 2 is shown as of the three electrode type comprising cathode 7 control electrode 8 and anode 6. Thermionic tubes 1 and 2 may be of the type employing four or more electrodes if so desired. Cathode 7 of thermionic tube 2 is energized from source. 10. Control electrode 8 of thermionic tube 2 is supplied with a source of biasing potential from source 14 by means of resistance 47, contact members 43, 44, 45 and 46 and high frequency choke coil 42. Anode 6 of thermionic tube 2 is energized from source 12 through high frequency choke coil 56. Control electrode 80f thermionic tube 2 is supplied with high frequency energy from thermionic tube 1 by means of capacity 36 and contacting members 23. The position of contacting members 23 and 24, like contacting member 19, may be varied with respect to inductance system 18 whereby corresponding contacting members on the coil comprising the inductance may be connected therewith.

The high frequency circuit comprising the output circuit of thermionic tube 2 in cludes capacity 37 connected with contacting members 49 and inductance system 48. Inductance system 48 is provided with suitable members for contacting with contacting members 49. Inductance system 48 is likewise adapted to contact with contacting members 51 and 52 which may be connected with a suitable space radio radiating system as shown, a wired radio system, or any suitable load circuit. Inductance systems 18 and 48 and multiple crystal holder 65 are adjusted simultaneously by means of a common control 68.

Fig. 2 shows a modification of the arrangement shownin Fig. 1. Reference characters correspond in all the figures. A sector 38 comprises part of the switching mechanism actuated by changing the inductance value of coil 48. Sector 38 makes contact with contacting members 40 whatever may bethe adjustments of frequency. Contactingmembers 40 are electrically connected to one terminal of telegraph key 69 and through resistance 47a to the negative terminal of tance coil 48 is'rotated, or the frequency char-- acteristics of the circuit changed, sector 38 disconnects choke 42a and in turn by engaging with contacting member 41, connects choke coil 42 in the circuit. Simultaneously with this change, sector 43 disengages with contact member 44 andengages with contact member 46. Contact member 46 is connected to a difierentportion ot'resistance 47 where by a different value of potential is supplied control electrode 8 of thermionic tube 2.

Fig. 3 shows the inductance system of my invention in greaterdetaila Like reference characters are employed throughout the drawings. Inductance winding 48 is supported by end members 61 and movable on a shaft member 60 bearing therein. Contacting members 49a and 49?) are supported by supporting member 65. Supporting member 65 may consist of suitable metallic material capable of electrically connecting contacting members 49a, 49?) and lug 650.. Inductance winding 48 may comprise an edgewound or flat wound ribbon of metal. Inductance winding 48 is rotatable with respect to cont-acting members 49a and 49b for selectively causing the engagement of movable contacting members 49 and 490. Contacting sector 43 of suitable metallic material is attachedto shaft'60 and rotatable therewith.

' 45 and 46 are supported by insulating member 62 which in-turn. is supported by end member 61. i 1

Fig.- 4 of the accompanying drawings shows a modification of the arrangement shown in Fig. 3. Here a, second contacting sector 38 isattached to shaft member 60 and rotatable therewith. Contacting members 39, 40 and 41 are spacially positioned each with respect to theother and supported by insulating member 63. Insulating member 62 is attached by suitable means to end mem' ber 61 and insulating member '63. Sector 38 is adapted to engage with contacting member 40 i-rrespective of the rotation of shaft member and to selectively engage with either contacting member 39 or contacting member 41. The electrical connections to contacting members 46, 45, 44, 43, 40 and 41 are schematically shown in Fig. 2 of the accompanying drawings.

The operation of the improvement-s in transmitting systems of my invention can best be understood by referring to Figs. 1 and 2 of the accompanying drawings. Thermionic tubes 1 and 2 having cathodes 4, 7, anodes 3, 6 and control electrodes 5, 8 are connected in suitable generating and amplifying circuit arrangements respectively. Cathode circuits 4 and 7 of thermionic tubes 1 and 2 are energized from sources 9 and 10 respectively. Anodes 3 and 6 of thermionic tubes 1 and 2 are energized from sources 11 and 12 respectively. High frequency electrical energy generated by thermionic tube 1 and associated circuits is amplified by thermionic tube 2 and associated amplifier circuits. The output of thermionic tube 2 is connected with a suitable load circuit by means of contacting members 51. A change in the frequency of the generated energy is effected by rotating inductance winding 18 connected with thermionic tube 1.

The rotation of inductance winding 18 causes suitably positioned contacting members mounted adjacent inductance 18 to engage with contacting members 19, 23 and 24. The contacting members 19 and 24 are connected with electrodes of thermionic tube 1.

.' A change in the frequency characteristics of thermionic tube 2 and associated amplifier circuit is effected by rotating inductance 48 and causing difierently positioned contacting members associated with the winding to engage with contacting members 49, 51 and 52. Contacting members 49 and 52 are connected with the electrodes of thermionic tube 2. Such frequency characteristics of both generator and amplifier circuits are simultaneously adjusted by suitable mechanical connection controllable by a common control member 68 or individually adjusted by control members 53 and 54, respectively. Multiple crystal holder is in like manner controlled by member 68 whereby different piezo electric crystals 66 are placed in electrical relation with electrode 67. Control electrode biasing potential is supplied thermionic tube 2 from source 14. When inductance 48 is rotated contacting sector 43 causes the completion of the circuit for supplying the control electrode potential of thermionic tube 2 by means of contacting members '45 and 44 or 46. Contacting members 44 and 46 are connected with resistance 47 Resistance 47 is connected with source 14 whereby different values of potential are supplied contacting members 44 and 46 with respect to cathode circuit 7. Thus for a certain frequency adjustment, a certain part of resistance 47 is connected to sector 43 by contacting members 44.

A change in the frequency characteristics of inductance 48 is caused by the rotation of the inductance and this rotation simultaneously causes contacting sector 43 to open the connection to this portion of resistance 47 and to connect to a different portion thereof.

In the arrangement shown in Fig. 2, contacting sector 38 connects either choke 42 or 42a, and disconnects the other high frequency choke coil, when inductance 48 and sector 38 are rotated. This causes a change in the frequency of the generated energy and necessitates a change in the selected piezo electric elements 66 carried by rotatable drum 65. To cause this change drum 65 is rotated and contacting member 67 is caused to be adjacent to a. different crystal carried by the drum 65, as in Fig. 1. Simultaneously with this change in the frequency characteristics of the generator and amplifier circuits the control electrode biasing potential is adjusted to a different value. This is accomplished by contacting sector 43 establishing a different connection on resistance47, as in Fig. 1. Simultaneously with this change in the control electrode biasing potential supplied thermionic tube 2, high frequency choke coils 42 and42a are interchanged in the control electrode biasing circuit by sector 38 and contacting members 39 and 41. This avoids the possibility of resonant frequency effect with the frequency of the energy in inductance winding 48 as it does also avoid the possibility of resonate effect with the frequency of the generated energy from thermionic tube'l. This is especially important where the generator and amplifier frequency characteristics are multiples or reciprocals of the other.

I realize that many modifications of the improvements in transmitting systems of my invention are possible without departing from the spirit of my invention. Generators and batteries are shown in the accompanying drawings, however it is obvious that any suitable'sources of. electrical energy may be employed in their stead. Any number of thermionictube circuits may be employed and the system adapted to the particular application desired. It is to be understood that my invention shall not be restricted to the accompanying drawings or to the foregoing specification but only as defined in the appended claims.

. Vhat I claim as new and desire to secure by Letters Patent of the United States is as follows: I

1. A transmitting system comprising in combination a thermionic tube having energy supply circuits connected with the electrodes thereof, input and output circuits therefor comp-rising inductance, means for adjusting the frequency characteristics of said inductance,-and contacting means actuated coop-' eratively with said adjusting means whereby the energy from said supply circuits is varied in accordance with the actuation 'of said adjusting means. I

2. A transmitting system comprising in combination a plurality of thermionic tubes having energy supply circuits connected with the electrodes thereof, input and output circuits therefor comprising inductance, means for adjusting the frequency characteristics of said inductance, and contacting means actuated cooperatively with said adjusting means whereby the energy from said supply circuits is varied in accordance with the actuation of said adjusting means.

3. A transmitting system comprising in combination a thermionic tube having energy supply circuits for the several electrodes thereof, an input circuit, an output circuit, high frequency choke coils connected with said energy supply circuits and said tube, said input and output circuits comprising inductance, means for adjusting the frequency characteristics of said inductance, and means actuated cooperatively with said adjusting means whereby the value of said energy supplied said tube iscontrolled by the actuation of said frequency adjusting means.

4. A transmitting system comprising in combination a thermionic tube having cathode, anode and'control electrodes, energy supply circuits connected with said electrodes, high frequency choke coils connected with said energy supply circuits, input and output circuits, a plurality of piezo electric crystal elements rotatably mounted for selective connection with the input circuits of said thermionic tube for controlling the frequency thereof, an adjustable switching system for varying the potential applied to said electrodes, and said switching system electricallv connected to individual connections of said high frequency choke coils.

5. A transmitting system comprising in combination a thermionic tube having energy supply circuits connected with the electrodes thereof, input and output circuits, high frequency choke coils connected with said energy supply circuits, said high'frequency choke coils having individual connections from their respective windings to said input and output circuits of said tube, means for adjusting the frequency characteristics of the circuits of said tube, a switching system me chanically connected to said last mentioned means, and said switching system being adapted to change the individual connections of said high frequency choke coils to said energy supply circuits.

6. In a transmitting system employing thermionic tubes the combination of means actuated bya single control for adjusting the frequency characteristics of the input circuit of said system andsimultaneously adjusting. cooperatively the frequency characteristics of the output circuit of said system andthe control electrode biasing potential supplied said thermionic tubes.

7. A transmitting system comprising in combination thermionic tubes, energy supply circuits for the electrodes of said tubes, input and output circuits, adjustable inductances for controlling the high frequency energy in said input and output circuits of said tubes, a'plurality of switching members cooperatively actuated with means for adjust-- ing the frequency characteristics of said inductances and operable with the adjustment thereof, and said switching members being connected with said sources of energy whereby the value of energy supplied said electrodes is dependent upon the adjustment of said inductances. 1

8. A transmitting system comprising in combination thermionic tubes, energy supply circuits for the electrodes of said tubes, input and output circuits, adjustable inductances for controlling the high frequency energy in said input and output circuits of said tubes, a plurality of switching members co-- operatively actuated means for adjusting the frequencycharacteristics of said inductances and operable with the adjustment thereof, and said switching members being connected with said sources of energy whereby the value of energy supplied said electrodes is adjustable with'the actuation of said frequency adjusting means. w

9. In a transmitting system employing thermionic tubes having control electrodes, anode electrodes and cathode electrodes, energy supply circuits connected with said electrodes, adjustable inductances in electrical. relation with said tubes adapted to control the frequency of high frequency energy in said system, anda plurality of switching members connected with said energy supply circuits for said control electrodes, and cooperatively actuated bythe control for adjusting said adjustable inductances.

i 10. In a transmitting system, a thermionic tube having'cathode, anode andcontrol electrodes, input and output circuits therefor, sources of anode and control electrode 'poten-' tial, means for varying the frequency of said input circuit, means for varying the frequency of said output circuit, and means for vary-,- ing said control electrode potential, and a common controlling structure for simultaneously controlling allof said frequency and potential varyingmeans.

11. In a transmitting system, a thermionic tube having cathode, anode and control electrodes, input and output circuits therefor; sources of-anode and control electrode poten-. tial, means for varying the frequency of said input circuit consist-ing of a. .mechanically vibratile element connected in said input circuit, means for varying the frequency of said output circuit and means for varying said control electrode potential, and a common controlling structure for simultaneously controlling all of said frequency and potential varying means.

- ARTHUR M. TROGNER.

CERTIFICATE or CORRECTION.

Patent No. 1,823,177. Granted September 15, 1931, to

ARTHUR M. TROGNER.

It is hereby certified that the above numbered patent was erroneously issued to "Radio, Inc., of New York, N. Y., a corporation of Delaware", whereas said patent should have been issued to Wired Radio, inc, of New York, N. Y., a corporation of Delaware, said corporation being assignee of the entire interest in said invention, as shown by the records of assignments in this office; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 17th day of November, A. D. 1931.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

